Geoff Tennant, a 6 Sigma consultant from the United Kingdom, makes use of the next analogy to explain the difference: A supermarket's purchaser is the individual obtaining milk at that grocery store; a not-purchaser buys milk from the competing supermarket, whereas a non-consumer would not invest in milk from supermarkets https://arnean.com/revamping-roads-the-essential-guide-to-asphalt-paving-and-repair/